Sink



FIG. 1 is a top view of our new design for a sink.

FIG. 2 is a front view of our new design for a sink.

FIG. 3 is a right side view of our new design for a sink.

FIG. 4 is a bottom view of our new design for a sink.

FIG. 5 is a perspective view showing the front, top, and right sideviews of our new design for a sink; and,

FIG. 6 is a perspective view showing the top, front, and left side viewsof our new design for a sink.

CLAIM The ornamental design for a sink, as shown and described.